Home / 20,985.20-28,957.08-11,553.20

Finding the Fourth Proportional to 20,985.20, 28,957.08 and 11,553.20

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Solution

The fourth proportional to 20,985.20, 28,957.08 and 11,553.20 is: 15,942.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.20 : 28,957.08 = 11,553.20 : x
  2. Step 2: Convert to fraction form
    20,985.20/28,957.08 = 11,553.20/x
  3. Step 3: Cross multiply
    20,985.20x = 28,957.08 × 11,553.20
  4. Step 4: Simplify right side
    20,985.20x = 334,546,936.66
  5. Step 5: Solve for x
    x = 334,546,936.66/20,985.20
  6. Step 6: Final answer
    x = 15,942.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.